Effect of <i>n</i>(SiO<sub>2</sub>)/<i>n</i>(Al<sub>2</sub>O<sub>3</sub>) molar ratio on physical properties and microstructure of foamed geopolymer
The foaming geopolymer was prepared by experiments using circulating fluidized bed combustion fly ash (CFAS),silica fume (SF),water glass (WG),NaOH and H<sub>2</sub>O<sub>2</sub>,and silica fume was used to adjust the <i>n</i>(SiO<sub>2</sub>)/<i>...
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| Format: | Article |
| Language: | English |
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Emergency Management Press
2019-06-01
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| Series: | 矿业科学学报 |
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| Online Access: | http://kykxxb.cumtb.edu.cn/article/id/222 |
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| author | Rui Yafeng Wang Dongmin Cui Yong Yuan Ning Jiao Yaru |
| author_facet | Rui Yafeng Wang Dongmin Cui Yong Yuan Ning Jiao Yaru |
| author_sort | Rui Yafeng |
| collection | DOAJ |
| description | The foaming geopolymer was prepared by experiments using circulating fluidized bed combustion fly ash (CFAS),silica fume (SF),water glass (WG),NaOH and H<sub>2</sub>O<sub>2</sub>,and silica fume was used to adjust the <i>n</i>(SiO<sub>2</sub>)/<i>n</i>(Al<sub>2</sub>O<sub>3</sub>) molar ratio of the geopolymers,the fresh paste was tested for foaming expansion factor and foaming rate.The strength and apparent density of the paste were tested after hardening.This paper analyzed the pore size distribution by Image-Pro Plus software,and the microstructures of the foamed geopolymers were analyzed by X-ray diffraction (XRD),Fourier transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM).The results show that the increase of the molar ratio of <i>n</i>(SiO<sub>2</sub>)/<i>n</i>(Al<sub>2</sub>O<sub>3</sub>) accelerates the hydration reaction rate,and the appropriate ratio makes the foaming time advance.The wavelength shift in the FTIR indicates that the Si—O and Al—O bonds rearrange after alkali-excited,and the appropriate ratio is favorable for the rearrangement reaction of the geopolymer and increases the degree of polymerization.The product such as zeolite was formed found by XRD pattens.When the <i>n</i>(SiO<sub>2</sub>)/<i>n</i>(Al<sub>2</sub>O<sub>3</sub>) molar ratio is 2.79,the strength and apparent density of the specimen in 28 d are 1.06 MPa and 231 g/L,and the microstructure of the specimen has good compactness. |
| first_indexed | 2024-04-11T16:13:01Z |
| format | Article |
| id | doaj.art-39dadf545f8e449182f0443050e13d9c |
| institution | Directory Open Access Journal |
| issn | 2096-2193 |
| language | English |
| last_indexed | 2024-04-11T16:13:01Z |
| publishDate | 2019-06-01 |
| publisher | Emergency Management Press |
| record_format | Article |
| series | 矿业科学学报 |
| spelling | doaj.art-39dadf545f8e449182f0443050e13d9c2022-12-22T04:14:38ZengEmergency Management Press矿业科学学报2096-21932019-06-014326126810.19606/j.cnki.jmst.2019.03.00920190309Effect of <i>n</i>(SiO<sub>2</sub>)/<i>n</i>(Al<sub>2</sub>O<sub>3</sub>) molar ratio on physical properties and microstructure of foamed geopolymerRui Yafeng0Wang Dongmin1Cui Yong2Yuan Ning3Jiao Yaru4School of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing 100083, ChinaSchool of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing 100083, ChinaSchool of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing 100083, ChinaSchool of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing 100083, ChinaSchool of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing 100083, ChinaThe foaming geopolymer was prepared by experiments using circulating fluidized bed combustion fly ash (CFAS),silica fume (SF),water glass (WG),NaOH and H<sub>2</sub>O<sub>2</sub>,and silica fume was used to adjust the <i>n</i>(SiO<sub>2</sub>)/<i>n</i>(Al<sub>2</sub>O<sub>3</sub>) molar ratio of the geopolymers,the fresh paste was tested for foaming expansion factor and foaming rate.The strength and apparent density of the paste were tested after hardening.This paper analyzed the pore size distribution by Image-Pro Plus software,and the microstructures of the foamed geopolymers were analyzed by X-ray diffraction (XRD),Fourier transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM).The results show that the increase of the molar ratio of <i>n</i>(SiO<sub>2</sub>)/<i>n</i>(Al<sub>2</sub>O<sub>3</sub>) accelerates the hydration reaction rate,and the appropriate ratio makes the foaming time advance.The wavelength shift in the FTIR indicates that the Si—O and Al—O bonds rearrange after alkali-excited,and the appropriate ratio is favorable for the rearrangement reaction of the geopolymer and increases the degree of polymerization.The product such as zeolite was formed found by XRD pattens.When the <i>n</i>(SiO<sub>2</sub>)/<i>n</i>(Al<sub>2</sub>O<sub>3</sub>) molar ratio is 2.79,the strength and apparent density of the specimen in 28 d are 1.06 MPa and 231 g/L,and the microstructure of the specimen has good compactness.http://kykxxb.cumtb.edu.cn/article/id/222molar ratiogeopolymerstrengthpore size distribution |
| spellingShingle | Rui Yafeng Wang Dongmin Cui Yong Yuan Ning Jiao Yaru Effect of <i>n</i>(SiO<sub>2</sub>)/<i>n</i>(Al<sub>2</sub>O<sub>3</sub>) molar ratio on physical properties and microstructure of foamed geopolymer 矿业科学学报 molar ratio geopolymer strength pore size distribution |
| title | Effect of <i>n</i>(SiO<sub>2</sub>)/<i>n</i>(Al<sub>2</sub>O<sub>3</sub>) molar ratio on physical properties and microstructure of foamed geopolymer |
| title_full | Effect of <i>n</i>(SiO<sub>2</sub>)/<i>n</i>(Al<sub>2</sub>O<sub>3</sub>) molar ratio on physical properties and microstructure of foamed geopolymer |
| title_fullStr | Effect of <i>n</i>(SiO<sub>2</sub>)/<i>n</i>(Al<sub>2</sub>O<sub>3</sub>) molar ratio on physical properties and microstructure of foamed geopolymer |
| title_full_unstemmed | Effect of <i>n</i>(SiO<sub>2</sub>)/<i>n</i>(Al<sub>2</sub>O<sub>3</sub>) molar ratio on physical properties and microstructure of foamed geopolymer |
| title_short | Effect of <i>n</i>(SiO<sub>2</sub>)/<i>n</i>(Al<sub>2</sub>O<sub>3</sub>) molar ratio on physical properties and microstructure of foamed geopolymer |
| title_sort | effect of i n i sio sub 2 sub i n i al sub 2 sub o sub 3 sub molar ratio on physical properties and microstructure of foamed geopolymer |
| topic | molar ratio geopolymer strength pore size distribution |
| url | http://kykxxb.cumtb.edu.cn/article/id/222 |
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